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I had a similar effect once on a booster for an old Girling (Volvo 1800) system. I (yes, I) rebuilt the booster and it would stick in the brakes engaged position if started while holding the brake pedal down. Tapping the booster (a separate unit from the MC in this application) would often cause it to unstick. Needless to say, I didn't try to drive this way. One good hard stop and I'd not have been able to release the brakes. On units with integral MC/booster, I suspect the brake pedal would end up stuck in the engaged position.
You might be able to test this theory by disconnecting and plugging the booster vacuum hose. I suspect it wouldn't stick then, and you'd have the MC question separated from the booster question.
Or so I think....
Michael
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